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f360f94a05
The optimization is achieved by following techniques:
> data alignment [gain from aligned memory access on read/write]
> POWER7 gains performance with loop unrolling/unwinding
[gain by reduction of branch penalty].
> zero padding done by calling optimized memset
45 lines
1.4 KiB
ArmAsm
45 lines
1.4 KiB
ArmAsm
/* Optimized stpncpy implementation for POWER7.
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Copyright (C) 2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#define USE_AS_STPNCPY
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#undef EALIGN
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#define EALIGN(name, alignt, words) \
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.section ".text"; \
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ENTRY_2(__stpncpy_power7) \
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.align ALIGNARG(alignt); \
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EALIGN_W_##words; \
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BODY_LABEL(__stpncpy_power7): \
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cfi_startproc; \
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LOCALENTRY(__stpncpy_power7)
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#undef END
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#define END(name) \
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cfi_endproc; \
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TRACEBACK(__stpncpy_power7) \
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END_2(__stpncpy_power7)
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#undef libc_hidden_builtin_def
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#define libc_hidden_builtin_def(name)
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#define MEMSET __memset_power7
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#include <sysdeps/powerpc/powerpc64/power7/stpncpy.S>
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